Re: btrfs hanging since 3.16-rc3 or so

Liu Bo
2014-07-16T07:42:05Z

Hi,

On Tue, Jul 15, 2014 at 10:47:01PM +0100, Hugo Mills wrote:
> cc linux-btrfs list
>
> On Tue, Jul 15, 2014 at 10:40:46PM +0900, Norbert Preining wrote:
> > Dear all
> >
> > (please keep Cc)
> >
> > Since 3.16-rc3 or so I regularly get btrfs hanging in some transations.
> >
> > Usually during apt-get upgrade or some other large file operations
> > (cowbuilder building of packages).
> >
> > The log files give me for loads of processes things like:
> > [ 6236.746546] INFO: task aptitude:22775 blocked for more than 120 seconds.
> > [ 6236.746547] Tainted: G W O 3.16.0-rc5 #27
> > [ 6236.746548] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > [ 6236.746549] aptitude D ffff8800b21a3868 0 22775 22709 0x00000000
> > [ 6236.746550] ffff88003644fd10 0000000000000082 ffffffff81a15500 ffff88003644ffd8
> > [ 6236.746552] ffff8800b21a3430 0000000000011c00 ffff880147da9c30 ffff880147da9c30
> > [ 6236.746553] ffff88003644fd58 ffff880034b3ed48 ffff880034b3ed38 ffff88003644fd20
> > [ 6236.746555] Call Trace:
> > [ 6236.746557] [<ffffffff81585b4a>] schedule+0x64/0x66
> > [ 6236.746560] [<ffffffff811bb22e>] btrfs_wait_logged_extents+0xa4/0xdc
> > [ 6236.746561] [<ffffffff810635c1>] ? finish_wait+0x5d/0x5d
> > [ 6236.746564] [<ffffffff811d9489>] btrfs_sync_log+0x5ef/0x8a2
> > [ 6236.746567] [<ffffffff811b43cf>] btrfs_sync_file+0x21b/0x24d
> > [ 6236.746569] [<ffffffff811b43cf>] ? btrfs_sync_file+0x21b/0x24d
> > [ 6236.746571] [<ffffffff8110db8a>] vfs_fsync_range+0x1c/0x1e
> > [ 6236.746574] [<ffffffff810d1681>] SyS_msync+0x15d/0x1ea
> > [ 6236.746575] [<ffffffff81588712>] system_call_fastpath+0x16/0x1b
> >
> > THis is aptitude, but I have all the other tasks accessing the disk
> > hanging, too.
> >
> > This time, issueing a Sysrq-s for emergency syncing did the laptop
> > out of the hang.
> >
> > Hardware: Sonly VAIO Pro 13
> > Distribution: Debian/sid
> > self compiled kernel, config on request.
> >
> > Please let me know if there is anything else I can provide.

Would you please try this patch?

[PATCH] Btrfs: fix abnormal long waiting in fsync
https://patchwork.kernel.org/patch/4564961/

thanks,
-liubo

> >
> > Thanks a lot
> >
> > Norbert
> >
> > ------------------------------------------------------------------------
> > PREINING, Norbert http://www.preining.info
> > JAIST, Japan TeX Live & Debian Developer
> > GPG: 0x860CDC13 fp: F7D8 A928 26E3 16A1 9FA0 ACF0 6CAC A448 860C DC13
> > ------------------------------------------------------------------------
>
> --
> === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
> PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
> --- Normaliser unix c'est comme pasteuriser le Camembert ---